Observation of Linear Scaling of Superconductivity with Crystal Orientation at a-LaAlO_{3}/KTaO_{3} Interfaces.

Authors

Xueshan Cao, Meng Zhang, Yishuai Wang, Ming Qin, Yi Zhou, Yanwu Xie

Published in

Physical review letters. Volume 136. Issue 25. Pages 256002. Jun 26, 2026.

Abstract

The superconducting transition temperature T_{c} at KTaO_{3}-based oxide interfaces exhibits a dramatic dependence on crystallographic orientation, yet a unifying mechanism remains elusive. Here, we report a linear scaling between T_{c} and a single geometric parameter-the angle θ between the (hkl) plane and the (100) plane-across ten different orientations of amorphous-LaAlO_{3}/KTaO_{3} interfaces. Except for (100), all orientations exhibit two-dimensional superconductivity, with transition temperatures T_{c} ranging from ∼0.12 to 2.1 K. This linear θ-T_{c} scaling is robust against variations in growth temperature, device geometry, and transport configuration. By establishing the geometric orientation angle as a robust empirical scaling parameter for the superconducting transition, our results set a critical phenomenological benchmark for future microscopic theories of superconductivity in KTaO_{3}-based systems.

PMID:
42430644
Bibliographic data and abstract were imported from PubMed on 11 Jul 2026.

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